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/*
* @test
* @bug 8163969
* @summary Test interface initialization states and when certain interfaces are initialized
* in the presence of initialization errors.
* @run main InterfaceInitializationStates
*/
import java.util.List;
import java.util.Arrays;
import java.util.ArrayList;
public class InterfaceInitializationStates {
static List<Class<?>> cInitOrder = new ArrayList<>();
// K interface with a default method has an initialization error
interface K {
boolean v = InterfaceInitializationStates.out(K.class);
static final Object CONST = InterfaceInitializationStates.someMethod();
default int method() { return 2; }
}
// I is initialized when CONST is used, and doesn't trigger initialization of K,
// I also doesn't get an initialization error just because K has an initialization error.
interface I extends K {
boolean v = InterfaceInitializationStates.out(I.class);
static final Object CONST = InterfaceInitializationStates.someMethod();
}
// L can be fully initialized even though it extends an interface that has an
// initialization error
interface L extends K {
boolean v = InterfaceInitializationStates.out(L.class);
default void lx() {}
static void func() {
System.out.println("Calling function on interface with bad super interface.");
}
}
// Another interface needing initialization.
// Initialization of this interface does not occur with ClassLIM because K throws
// an initialization error, so the interface initialization is abandoned
interface M {
boolean v = InterfaceInitializationStates.out(M.class);
default void mx() {}
}
static class ClassLIM implements L, I, M {
boolean v = InterfaceInitializationStates.out(ClassLIM.class);
int callMethodInK() { return method(); }
static {
// Since interface initialization of K fails, this should never be called
System.out.println("Initializing C, but L is still good");
L.func();
}
}
// Finally initialize M
static class ClassM implements M {
boolean v = InterfaceInitializationStates.out(ClassM.class);
}
// Iunlinked is testing initialization like interface I, except interface I is linked when
// ClassLIM is linked.
// Iunlinked is not linked already when K gets an initialization error. Linking Iunlinked
// should succeed because it does not depend on the initialization state of K for linking.
interface Iunlinked extends K {
boolean v = InterfaceInitializationStates.out(Iunlinked.class);
}
// More tests. What happens if we use K for parameters and return types?
// K is a symbolic reference in the constant pool and the initialization error only
// matters when it's used.
interface Iparams {
boolean v = InterfaceInitializationStates.out(Iparams.class);
K the_k = null;
K m(K k); // abstract
default K method() { return new K(){}; }
}
static class ClassIparams implements Iparams {
boolean v = InterfaceInitializationStates.out(ClassIparams.class);
public K m(K k) { return k; }
}
public static void main(java.lang.String[] unused) {
// The rule this tests is the last sentence of JLS 12.4.1:
// When a class is initialized, its superclasses are initialized (if they have not
// been previously initialized), as well as any superinterfaces (s8.1.5) that declare any
// default methods (s9.4.3) (if they have not been previously initialized). Initialization
// of an interface does not, of itself, cause initialization of any of its superinterfaces.
// Trigger initialization.
// Now L is fully_initialized even though K should
// throw an error during initialization.
boolean v = L.v;
L.func();
try {
ClassLIM c = new ClassLIM(); // is K initialized, with a perfectly good L in the middle
// was bug: this used to succeed and be able to callMethodInK().
throw new RuntimeException("FAIL exception not thrown for class");
} catch (ExceptionInInitializerError e) {
System.out.println("ExceptionInInitializerError thrown as expected");
}
// Test that K already has initialization error so gets ClassNotFoundException because
// initialization was attempted with ClassLIM.
try {
Class.forName("InterfaceInitializationStates$K", true, InterfaceInitializationStates.class.getClassLoader());
throw new RuntimeException("FAIL exception not thrown for forName(K)");
} catch(ClassNotFoundException e) {
throw new RuntimeException("ClassNotFoundException should not be thrown");
} catch(NoClassDefFoundError e) {
System.out.println("NoClassDefFoundError thrown as expected");
}
new ClassM();
// Initialize I, which doesn't cause K (super interface) to be initialized.
// Since the initialization of I does _not_ cause K to be initialized, it does
// not get NoClassDefFoundError because K is erroneous.
// But the initialization of I throws RuntimeException, so we expect
// ExceptionInInitializerError.
try {
Object ii = I.CONST;
throw new RuntimeException("FAIL exception not thrown for I's initialization");
} catch (ExceptionInInitializerError e) {
System.out.println("ExceptionInInitializerError as expected");
}
// Initialize Iunlinked. No exception should be thrown even if K
// (its super interface) is in initialization_error state.
boolean bb = Iunlinked.v;
// This should be okay
boolean value = Iparams.v;
System.out.println("value is " + value);
ClassIparams p = new ClassIparams();
try {
// Now we get an error because K got an initialization_error
K kk = p.method();
throw new RuntimeException("FAIL exception not thrown for calling method for K");
} catch(NoClassDefFoundError e) {
System.out.println("NoClassDefFoundError thrown as expected");
}
// Check expected class initialization order
List<Class<?>> expectedCInitOrder = Arrays.asList(L.class, K.class, M.class, ClassM.class,
I.class, Iunlinked.class, Iparams.class,
ClassIparams.class);
if (!cInitOrder.equals(expectedCInitOrder)) {
throw new RuntimeException(
String.format("Class initialization array %s not equal to expected array %s",
cInitOrder, expectedCInitOrder));
}
}
static boolean out(Class c) {
System.out.println("#: initializing " + c.getName());
cInitOrder.add(c);
return true;
}
static Object someMethod() {
throw new RuntimeException();
}
}